十六烷基三辛基铵静电吸附氯金酸的Langmiur-Blodgett膜及其修饰聚氯乙烯液膜金离子选择性电极的研究

首次尝试用Langmiur-Blodgett(LB)技术修饰PVC液膜离子选择性电极,在PVC液膜表面上制得十六烷基三辛基铵-氯金酸LB膜,明显改善了PVC液膜金离子选择性电极的某些工作性能。电极线性响应范围为1×10~(-2)～1×10~(-7)mol/L,对常见的9种阳离子和4种阴离子的干扰能力明显的增强,响应速度也有所提高。若能改进挂膜方式,可望进一步改善有关性能。

The Langmuir Blodgett Film of Trioctylcetyl Ammonium-Chloroauric Acid and Its Modification on the Polyvinyl Chloride Liquid Membrane-Gold Selective Electrode

The Langmuir Blodgett(LB) technique was employed to modify the PVC liquid membrane, the LB film of trioctylcetyl ammonium chloroauric acid was deposited on the surface of PVC liquid membrane, and the gold selective electrode with such modification has been fabricated. The linear response range of the modified electrode is 10-7-10-2 mol/L with the response time of less than 1 min, while 9 cations and 4 an-ions, usually coexisted do not interfere with the measurement. The possible mechanism and factors for the improvement of the electrode characters, compared with the non-modified electrode, are discussed. The electrode may be prepared wiht the different orientation of the moleoules in the film by changing the deposition manner of LB film.